2 practical antenna design 140 -150 mhz vhf transceivers online edition elpidio latorilla ledf media With this antenna I was heard 124 km away from me. This item is currently out of stock. 2 Meter 440 Vertical Collinear Antenna Project by W7LPN ...Homemade ADS-B Collinear Antenna - RTL-SDR Depending on the materials in your "junk box", you could build this VHF/UHF antenna for almost no cost. I have that crimped to an F-Type connector, adapter to an F-type to BNC then into a BNC to SMA (Waiting for my F to SMA to come in from Amazon). My question is if I were to have one dipole element facing the exact (180 degree) opposite direction . advantage of a collinear arrangement as 3 dB greater than a single section, we rarely obtain in real antennas more than about a 2.0-2.5 dB increase in gain. SlimJim 2M Antenna Sperrtof 2M Antenna-- aka Sleeve Dipole or Sleeve J-Pole. Being the crafty maker type, I wanted to build my own antenna. It requires no radials, is totally weather protected, and only 5 ½ feet tall. antenna which covers the VHF (2 meter), 220 MHz, and 70cm amateur band. Building a Coaxial Collinear Antenna Discussion Vertical antennas "with gain" are usually pretty tough to build utilizing tools found around the average home. I am considering constructing a collinear antenna from "Practical Antenna Design 140-150 mhz" book. Super J-Pole Antenna (Collinear Design) - By KB0YKI 2M, 220, 440, 6M J-Poles Antennas — Dimensions, matching, everything — from Bux CommCo — Be sure to read importance of a decoupling loop. 2. Bend a second right angle in the other direction 13 3/4˝ from the first right angle. Gain. Recently the RASON technical committee was hard at work at the repeater site repairing our 2 meter repeater antenna. 2 meter collinear by m3fvb. While it is not always feasible to home-brew a commercial quality antenna designed to take hurricane force winds, it is very feasible to built a collinear . This article describes a collinear antenna made from very inexpensive RG58/U coaxial cable and encased in PVC pipe. The costs are practically low if it is made from surpluses of 3D2V (50 ohm cable). Shown to the left is the pattern Of the Moxon with all elements In place - Not too bad. Potential to use both ports at once. The 2 meter readings are as good as can be. Here's a popular antenna design for repeaters.http://www.sciencewriter.net This antenna is designed for amateur band frequency for both VHF (2m) and UHF (70cm). Fiber coupled for ease of movement. Collinear Coaxial Antenna Design Calculator. The average height of the collinear is about 2 meters higher, compared with a single 1/2 wave, so this will also play a part. DcMaw, Doug, WIFB'x Antenna Notebook, 1987. Resources listed under Collinear Antenna category belongs to Antennas main collection, and get reviewed and rated by amateur radio operators. VHF Hand Held Radios. The antenna is 68mm and the can is 68mm. If anyone could either help me or point me in the right direction. 2 / 440 vertical. One of the members commented to me that I should write an article about collinear arrays so that we could all build our own. If multi band use is desired, I would suggest building the balun for the lowest frequency. PRACTICAL ANTENNA DESIGN. I then built a cantenna. - Diamond CP22E VHF 144-148MHz 2 Meter Base / Repeater Antenna 6.5dBi Gain. 1988 ARRL Antenna Book. This type of an-tenna has an enhanced gain and directivity in E-plane. I decided it was time to set up a 2 Meter base station. The Coaxial Collinear is rarely mentioned in radio circles, odd . Messages: 3,785. Here are some comments from Clint: E. A collinear antenna, also called "co-linear" or "collinear antenna array", is a set of dipole antennas aligned along their length so they form one long line. The Antenna Farm : 2 Meter High Gain Antennas - VHF & UHF Mobile Radios Radio Accessories VHF & UHF Hand Held Radios Antennas Mobile Antenna Mounts SWR/Power Meters Adapters Coaxial Cable Two Way Accessories Antenna Accessories DC Power Supplies Coax Cable Accessories Amplifiers Connectors Aviation Radios Repeater Systems Towers & Accessories Scanners & Receivers Duplexers Diplexers . Give the antenna a good clean if necessary. Introduction: A collinear (or co-linear) antenna is an array of dipoles mounted in such a manner that every element of each antenna is in an extension, with respect to its long axis, of its counterparts in the other antennas in the array. Ships from and sold by GigaParts. A collinear antenna array is made up of dipole elements. As many attest, there is an advantage when vertically combining 1/2 radiating sections to have a bit of separation between the half-wave end points. On-line antenna designer. However, practically it is usually less than that due to losses. In a previous post we debunked the 2 meter 5/4 wave antenna as actually an end-fed full-wave antenna resulting in a poor radiation pattern hardly optimal for terrestrial use. DBJ-220 - Base station antenna (220-225MHz) Maximum input power 75 watts $35 DBJ - UHF (perfect for GMRS) +5dB Gain Antenna - US patent 8,947,313 +5dB gain no radial collinear - featured in CQ magazine (Summer 2012) $50 Accessories - please email or call so we know exactly the adapter you need. FREE Shipping. He says it's primarily a 2m antenna but operates well on 6 and 70 too. Yagi antennas, W8JK arrays, and log periodic dipole arrays are all end fire arrays. I only had room in the crappie pole for the 1/4^ stinger, 1/4^ bottom . The angle is low. Thanks to Clint of "Oxford Shortwave Log" for this coaxial collinear antenna system for 2m and 70cm. Remove hex head screw and small grub screw. I proceeded to make a very heavy dipole from copper pipe, akin to the type used for J-poles. It is simply two (2) half-wave elements fed with a quarter-wave stub. A compression hose clamp can be used to secure the PL-259 connector, attached to the feed line, in the end of the mast. Hardware . $67.00. References 1. Collinear vertical antenna design question. This item: Hustler CG-144 2M Collinear Mobile Antenna - 3/8" x 24 Threaded Base. Dusan Balara's Coaxial Collinear antenna for ADS-B receiver doesn't bother, but does have a 50/75 Ohm resistor on the end. Attached Images Screen Shot 2013-12-30 at 3.39.55 PM.jpg (13.5 KB, 95 views) 2.9 Suggestions or Questions If you have any suggestions or questions concerning this antenna, contact me either by packet at VE4WK@VE4KV.#WPG.MB.CAN.NOAM, or FAX: (204) 275-0261, or eMail: kinsner@ee.umanitoba.ca. The collinear is an old design, used by many commercial manufacturers. This project is about a cheap way of building a colinear antenna for VHF 145MHz, and having about 10dB more gain than that little 1/4-wave magmount I have not used for 6 years. If you fall into this category, please read the notes at the end of this article. Find 2 Meter Coaxial Collinear Antennas related suppliers, manufacturers, products and specifications on GlobalSpec - a trusted source of 2 Meter Coaxial Collinear Antennas information. 2 / 440 surprise! D LINK ANT24 1500 5 4 FT ANTENNA USER MANUAL Pdf Download. I have used this article to construct antennas for 2M, 220, and 440 voice repeaters. 2 meter dual bander (ultra cheap) na4it. a mono band device. 70 cm has it's peaks and valleys but is at or below 2.0 over almost the entire band making this an effective antenna on both bands. Build A 9dB 70cm Collinear Antenna - Circuit Wiring . The collinear antenna is designed to be mounted vertically. G-6270R HUSTLER G6270R. The author of that video has now posted on his blog a tutorial on how he made the coax collinear antenna. 2 meter 5/4 wave antenna. I settled on a 2 meter vertical dipole. Building instructions for the NEW WB3AYW Collinear Antenna slim jim antenna (basic design) 2 meter copper tubing slim jim by ke5fxu (more slim jims below) 2 meter 2bcx slim jim antenna Calculate the required dimensions for a coaxial collinear antenna construction for any given frequency. For maximum power transmission, 50 Ohm coax cables are used to match the RF PA's output impedence. Earlier in the week a video comparing a Discone to a Coax Collinear antenna for ADS-B reception was posted. 2m/70cm 6dB COLLINEAR VERTICAL. 2 / 440 surprise! 1. (does well on 440mhz also) This Balun can be adapted to any band. 2M Collinear Antenna QRZ Forums. This antenna is very easy to make with 50 ohm coaxial cables. XE1BEF VHF UHF ANTENNAS. It consists of five half-wave dipoles, four of which are end-fed by means of a 1/4-wave stub to invert the phase. Doubling the number of dipole elements, shall double the gain. The fix was to turn it into a collinear with the addition of a 180 degree phased stub between the two half-wave sections. 70 cm has it's peaks and valleys but is at or below 2.0 over almost the entire band making this an effective antenna on both bands. 2 meter 5/4 wave antenna. Overview. Building the Aerialix ARLX OM2400 Collinear Antenna Kit. $214.95. For these bands an antenna . And the SWR being low is no guarantee that the gain is good in the band of interest. PRACTICAL ANTENNA DESIGN. The Double 5/8 is a natural extension of the Single 5/8 and uses a 5/8λ element for both the top and bottom radiators. Homemade ADS-B Collinear Antenna. 2 m pvc mount gp. Enter the required frequency in MHz, the velocity factor of the coax . Hard to construct matching coils are normally needed as well as hardware and tubing which can be difficult to find. WB3AYW WIRE COLLINEAR FOR 2 METERS. to this antenna or any other antenna that requires a 1 to 1 balun for 2 meter operation. Before analyzing stacking (broadside) or collinear antennas, we really should understand how antenna systems produce gain. ost commercial 2-meter repeater antennas with gain fall into two categories: collinear arrays and stacked element arrays, with gains ranging from 3 to 9 dB1. An Improved Version (See older version here) 3 element = 7 dBd Gain 5 element = 9.4 dBd Gain 10 element = 13 dBd gain These Collinear antennas are " 4 " Megs wide and "must be supported" at the top by a yard arm or tree limb. 2 Meter, 5/4 Wave Antenna Revealed. NOTE: This is not an antenna for the beginner antenna builder! This type of antenna has an enhanced gain and directivity in E-plane. If mounting it outside, be sure to wrap the N-connector appropriately in self-amalgamating tape to prevent any moisture ingress. These di-poles are parallel and collinear with each other. Two measurement ports (0 and 90 ). antenna, with all the calculations included for any band. $\begingroup$ Not to knock this particular design, but there are a lot of collinear designs out there. Amazing what you can achieve with a metre and a bit of old RG58 an. By ON4CFC Via Antennex Super J-Pole Antenna (Collinear Design) - By KB0YKI VHF/UHF Antennas-- By KB0YKI -- J-Poles, Super J-Pole, Omnidirectional, Quads, Yagis VHF EggBeater Antenna - From ON6WG / F5VIF Quick and Simple 2 Meter Ground Plane Project Via HamUniverse 2M . I'm not sure exactly what design I used when I first built it, but they do seem to vary a little: N1HFX's Build a 9 dB, 70cm, Collinear antenna from coax includes a 1/4 wave element at each end. Having simulated and then built quite a few, I find that they always require tuning and tweaking to work properly. The CP22E is a high-gain monoband antenna made from heavy-duty aluminum construction, at a price your pocket book will like! In a previous post we debunked the 2 meter 5/4 wave antenna as actually an end-fed full-wave antenna resulting in a poor radiation pattern hardly optimal for terrestrial use. collinear RTL SDR. Dipoles Media Online. Antenna projects for 144 MHz category is a curation of 153 web resources on , Simple VHF Antenna, Magnetic Loop for the 2m band, The Tiny 3. • Compared to many vertical antennas, the collinear J-pole shows a remarkable reduction in high-angle radiation. Hi there, G1ZMA kindly decided to build me another antenna for 2m and 70cm and here it is. Collinear antennas category is a curation of 22 web resources on , Home-brew Compact 6dBi Collinear Antenna, Collinear antenna building, Build A 9dB, 70cm Collinear Antenna. The RSGB VHF UHF Manual by G. R. Jessop, G6JP suggests element lengths of 0.28λ to 0.30λ. Making an inexpensive 1090MHz ADS-B collinear antenna. The fix was to turn it into a collinear with the addition of a 180 degree phased stub between the two half-wave sections. The Slim Jim, designed by the late Fred Judd, G2BCX, can be a great portable 'roll up' antenna, if made out of 300Ω or 450Ω ladder line / twin feeder. 2 meter collinear by m3fvb. This antenna meets the demands set by ARES/RACES group for ruggedness, easy deployment, and performance. Dimensions for the 144, 222 and 440-MHz bands are given in Fig25. I need to tune it because the swr is too high on 2m as well as 6 and 70 but those don't seem to be quite as high in most of their respective band frequencies. COLLINEAR ANTENNA ARRAY A collinear antenna array is made up of dipole elements. Lost some blood scouring the inside to get a good electrical contact between the shielding of the (2m RG6U)) coax and the can. Resources listed under Antenna for 2 meters category belongs to Antennas main collection, and get reviewed and rated by amateur radio operators. This is post 2638 in a continuing series of simple ham radio antennas. 2 m pvc mount gp. You might need to use pliers to grip the connector if it is tight. Bend a third right angle in the same direction 1˝ from the second right angle. Choose your antenna's "center frequency" (f) and cut length A using the formula shown. The 2 meter readings are as good as can be. 2 meter dual bander (ultra cheap) na4it. 2 / 440 sleeve vert. Build A 9 dB, 70cm, Collinear Antenna From Coax. FINAL LEGAL STATEMENT I have released the antenna into the public domain. The best RF transmission system consists of matching impedence across all sections. They fire in the direction of the boom through the plane of the elements. 2 / 440 sleeve vert. However, practically it is usually less than that due to losses. I have tested that there are no shorts in the segments. •Heavy-duty aluminum antenna sections. 2 / 440 vertical. It is working quite well - although not quite as good as my first collinear. These dipoles are parallel and collinear with each other. They will also work well on digital and ATV. Check out the video tutorial below. R 50 Dual Band Vertical Collinear 2 70cm at Radioworld. The results are good. It's basically just two pieces of wire linked by a 4:1 balun. Bibliography. Aerial. About 6 months ago I thought I'd try one of these - 2m coaxial collinear vertical. FYI -- This was (many years ago) for a science fair I entered. If these antennas are to be mounted outside it is Properly aligned and phased, a collinear array can provide a 3 dB or more increase in signal strength. slim jim antenna (basic design) 2 meter copper tubing slim jim by ke5fxu (more slim jims below) 2 meter 2bcx slim jim antenna If you have no particular preference within a given ham radio band, then simply enter its center. T he antenna also works reasonable on 10 and 15m. Versions that he has built include 2M, 220, and 440 models, all for FM voice repeaters. Log-periodic Antenna • Wide frequency coverage • Less gain than yagi . Remove the short element and tune for resonance, proper SWR and impedance on the 2 meter frequency first. Figure 1 Complete 146MHz 1/4 λ ground plane assembly. 2 Meter, 5/4 Wave Antenna Revealed. Collinear antenna building, by Karl Shoemaker . This antenna delivers good performance and has a respectable SWR curve over the entire 2 meter band. Discussion in ' Antennas, Feedlines, Towers & Rotors ' started by KJ4EKS, Jul 23, 2008 . I adjusted the half wave and quarter wave sections for Velocity Factor and started cutting and assembling. The conduit radome provides a robust and sturdy enclosure for the antenna, and if required, it can be mounted outside in the weather. The actual gain of this antenna is +7.5dBd. Be careful not to damage the matching components or bend the copper rods and coils. P C A A D 7 Antenna Design Associates. For any vertical collinear array, the only place from which to CO LINEAR ANTENNA DESIGN While it is not possible to home-brew a commercial quality antenna, it is very feasible to build a collinear antenna for average use. The 2 - 440 Collinear vertical in this project is simple to build and expand, semi rigid, self supporting, water tight, electrically sound, and a professional appearance when completed. Only 4 left in stock - order soon. I have left the insulation on the center conductor. No significant interactions are observed with the three antennas except for 70CM effects from the 2m antenna. In this . While the dimensions are not critical ( +/- 10%), it is still basically . 2M Collinear Antenna QRZ Forums. Click to enlarge. 1991 ARRL Handbook. A 2-Meter Vertical Dipole Array Build this 2 or 4-Element VHF repeater antenna with up to 9.7 dBi gain and 18° Vertical Beamwidth. W7LPN says whenever he needed to tune one he built he just trimmed the . Matching is excellent on all three bands and can be tuned independently. A homebrew coaxial Collinear antenna for 2m （144MHz帯コリニアアンテナ）. The double 5/8 is a co-axially fed variation of the 1¼ wave (vertical) dipole shown in the adjacent diagram. I was shooting for 147.06 MHz, but the setting knob on most analyzers can be really touchy, so this was close . the "ll cool j" 2 meters for a song. Building the Aerialix ARLX OM2400 Collinear Antenna Kit. Build your own 2m/70cm 3 Elements VHF by 5 Elements UHF Yagi antenna with excellent gain for both VHF and UHF operation. In order to stack two, we proceed as follows: Fig. The 5/8 wave antenna consists of a vertical radiator, a loading coil and colinear plane at the base of the antenna. I'm working on a vertical antenna for VHF/UHF. Likes Received: 2,187. CB & Scanner Antennas. The collinear J-Pole, often known as the Super-J, does improve the behavior over a regular J-Pole. The collinear antenna was made from 6 segments of RG6, cut to 15cm lengths with ~2cm of wire exposed at each end of the segments. Antenna projects for 144 MHz category is a curation of 153 web resources on , Simple VHF Antenna, Magnetic Loop for the 2m band, The Tiny 3. RLX2 Series User Manual FCC ID. 5/8 vertical antenna design. the "ll cool j" 2 meters for a song. As the name suggests the 1/4 wave ground plane has elements that are a 1/4 of a wave length of the operating frequency in length, this however is the electrical length not the physical length. The antenna has good reflection coefficient and VSWR ratio @ 1.2:1 at center frequency and 1.7:1 at band […]